S. Kusolpermpool, E. Sanamthong, I. Suwathanpornkul, and W. Panjan, “The Development of a Competency Training Program for Accident Investigatory Personnel for Motor Non-Life Insurance Concerns”, Ph.D. in Soc. Sci. J., vol. 11, no. 1, pp. 218–229, Apr. 2021.